package com.atguigu.yjh.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.yjh.common.to.es.SkuEsModel;
import com.atguigu.yjh.common.utils.R;
import com.atguigu.yjh.search.config.asxyyjhElasticSearchConfig;
import com.atguigu.yjh.search.constant.EsConstant;
import com.atguigu.yjh.search.feign.ProductFeignService;
import com.atguigu.yjh.search.service.MallSearchService;
import com.atguigu.yjh.search.service.ProductSaveService;
import com.atguigu.yjh.search.vo.AttrResponseVo;
import com.atguigu.yjh.search.vo.SearchParam;
import com.atguigu.yjh.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.apache.lucene.util.QueryBuilder;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import javax.swing.*;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

//    去es进行检索
    @Override
    public SearchResult search(SearchParam param) {
        System.out.println("--------MallSearchServiceImpl---------");
//        动态构建出查询需要的DSL语句
        SearchResult result = null;

//        1.准备检索请求
        SearchRequest searchRequest = buildSearchRequrest(param);
        System.out.println("=========MallSearchServiceImpl============");
        try {
//2.执行检索请求
            SearchResponse response = client.search(searchRequest, asxyyjhElasticSearchConfig.COMMON_OPTIONS);
            result = buildSearchResult(response,param);
        }catch (IOException e){
            e.printStackTrace();
        }

        return result;
    }


    /**
     * 准备检索请求
     * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest buildSearchRequrest(SearchParam param){
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句
        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存
         */
        //1.构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
//        1.1.must-模糊匹配
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
//1.2. bool-filter-按照三级分类id查询
        if(param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2. bool-filter-按照品牌id查询
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //1.2. bool-filter-按照所有指定的属性进行查询
        if(param.getAttrs()!=null&&param.getAttrs().size()>0){
            for (String attrStr:param.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//这个属性的检索用的值
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        //1.2. bool-filter-按照库存是否进行查询
        if(param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }

//       1.2. bool-filter-按照价格区间
        if(!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if(s.length == 2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length == 1){
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }

                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
//        把以前的所有条件都进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，亮度
         */
//        2.1排序
        if(!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }

//        2.2分页
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

//        2.3亮度
        if(!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }
        /*
        聚合分析
         */

//        品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
//品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
//       TODO 1.聚合brand（品牌）
        sourceBuilder.aggregation(brand_agg);
//        2.分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
//        TODO 2.聚合catalog
        sourceBuilder.aggregation(catalog_agg);

//        属性聚合 attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
//聚合当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //        聚合分析当前所有的attr——id的对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
//聚合分析当前attr——id对应的所有可能的属性attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
//        TODO 3.聚合attr_agg
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println("-------构建的DSL--------");
        System.out.println(s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PROUCT_TNDEX}, sourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param){
        SearchResult result = new SearchResult();
//       1 返回的所有查询到的商品
        SearchHits hits = response.getHits();

       List<SkuEsModel> esModels = new ArrayList<>();
        if(hits.getHits()!=null&&hits.getHits().length>0){
            for (SearchHit hit:hits.getHits()){
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if(!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        System.out.println("============esModels===================");
        System.out.println(esModels);
        result.setProducts(esModels);
//       2 当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for(Terms.Bucket bucket : attr_id_agg.getBuckets()){
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
//            1.得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
//            2.得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();

//            3.得到属性的所有值
            List<String> attrValues= ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);


        }
        System.out.println("=--------------attrVos---------------");
        System.out.println(attrVos);
        result.setAttrs(attrVos);
//        3.当前所有商品涉及到的分类信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");//brand_agg
        for (Terms.Bucket bucket:brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
//            1.得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
//            2.得到品牌的名
            String brandName= ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();


//            3.得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);

            System.out.println("---------------brandVo--------------------");
            System.out.println(brandVo);
            brandVos.add(brandVo);


        }

        result.setBrands(brandVos);

//        4.当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket:buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
//            得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
//            得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");//brand_agg
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);


        }
        System.out.println("-------------catalogVos---------------------");
        System.out.println(catalogVos);
        result.setCatalogs(catalogVos);


//        5.分页信息-页码
        result.setPageNum(param.getPageNum());
//        5.分页信息-总记录
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//        6.分页信息-总页码
        int totalPages = (int) total%EsConstant.PRODUCT_PAGESIZE == 0?(int)total/EsConstant.PRODUCT_PAGESIZE:((int)total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for(int i=1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

//        6.构建面包屑导航功能
        if(param.getAttrs()!=null&&param.getAttrs().size()>0){

            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();

                String[] s = attr.split("_");
                navVo.setNavName(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {

                    });
                    navVo.setNavName(data.getAttrName());

                }else {
                    navVo.setNavName(s[0]);
                }
                String encode = null;
                try {
                    encode = URLEncoder.encode(attr, "UTF-8");
                    encode = encode.replace("+","%20");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }

                String replace = param.get_queryString().replace("&attrs=" + encode, "");
                navVo.setLink("http://search.gmall.com/list.html?"+replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }



        System.out.println("------result-------");
        System.out.println(result);
        return result;
    }
}
